Is my black throat shy or lazy ?

[markuss]

I got my new Black thraot monitor about 2 weeks ago at first he would not eat for 3 days probly bc he was scared but then he started eating really good and then he would not eat for a day or 2 i was told these guys are pigs and eat every day. but he seems very lazy to me he sleeps like all the time or at least that is what he wants me to think bc when i am out of the room he will move around a bit but not much.but when i enter the room he will just lay down and close his eyes and not move. so maby they are less active when they are younger my buddy has a 5' black throat and its very active where my little guy wont move much he is only 25" long from head to tail so he is still young. so maby someone could tell me if there is something i should do or stop worrying lol.